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Give the FULL mechanism for the synthesis of the product 1) BuLi, Et20,- 78 → .45 °C, 1 h 2) > Et20 TBSO / -78 .25 °C. 5 h 151 SS HMPA/E20, - 780°C OTBS -NHTS OTBS 152 TBS 56 % 150 1

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十B 1735 TBS olion 73)o To TO -NHO otro T3, Roney ni

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